East hosted West in this London derby, with Chelsea coming into the game fresh from a victory, whilst the hosts had managed just one win in their opening four fixtures.
This match was West Ham's third London derby in their opening five games, which saw them sink to their heaviest defeat of the season to date.
Here is four things we learnt from Chelsea's 3-0 victory over the Hammers.
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Sancho Starts
Jadon Sancho made his first start for Chelsea, with Enzo Maresca favouring the Englishman to Pedro Neto for this London Derby.
More significantly, he made his first Premier League start in well over a year, since his infamous falling out with Manchester United manager Erik Ten Hag.
Having made an impact with a match-winning assistant on his Chelsea debut last week, Sancho again showed why he could prove to be a bargain buy.
He gave Konstantinos Mavropanos a torrid time, working in unison with the overlapping Marc Cucurella, to expose the West Ham defence, which can be best-described as poor.
Maresca has nothing but good things to say about Sancho, whose attitude was called in to question by Ten Hag, and he looks to have settled quickly in West London. It seems likely that Lee Carsley and England will recall Sancho at the next opportunity.
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Nico Nets
Nicolas Jackson had a hand (or foot) in all three of Chelsea's goals. Putting the game beyond the hosts within 20 first half minutes with two goals.
In the second half, Jackson set up Cole Palmer to seal a 3-0 victory that did not flatter the visitors.
Jackson has faced some criticism during his time at Chelsea, with many thinking that were it not for Christopher Nkunku's injury problems, Jackson would most likely not feature in the first eleven.
This season, he has most certainly silenced his critics, currently sitting as Chelsea's top scorer, with three goals in the Premier League, and having bagged twenty goals in Chelsea Blue.
Whilst Nkunku is yet to start a game for Chelsea in this campaign, in fact, all of his four league goals across his two seasons in England have come as a substitute.
Jackson has started all five of Chelsea's games and has linked up well with Cole Palmer, making the pair the first-choice number nine and ten pairing. On this occasion, it was Jackson, rather than Palmer, who was the star of the show.
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Away Days
Chelsea secured just their third win at the London Stadium since West Ham made the former Olympic Park their home. The first time having been back in 2017, and the second in 2021.
Chelsea have won all of their away league fixtures this season, scoring ten goals and conceding just two on their travels, whilst notching up two clean sheets.
Maresca has achieved the accolade of being the first manager since Pep Guardiola in 2016, to win all of his first three away games.
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Right-back red flags
Wesley Fofana started at right-back for Chelsea in this game, with captain Reece James and Malo Gusto still waiting on the sidelines as a result of injuries.
Only Gusto has so far featured for Chelsea in the 2024-25 season, starting the first three games, before picking up an injury in the game against Crystal Palace.
Despite the relaxed nature of the victory at the London Stadium,, Fofana looked far from comfortable in this role.
The Frenchman was lucky not to concede a penalty for shirt-pulling in the first-half, and picked up a yellow card in the first 45 minutes in a separate incident.
Fofana was replaced by his compatriot Axel Disasi, who has previously taken a turn at right-back, following a change from West Ham which saw him matched up against Mohammed Kudus, potentially further exposing Fofana's vulnerability.
Gusto is believed to be closer to a return than James, with the club captain's return date unknown. For Gusto, it is believed to be a case of regaining fitness.
